Two-party quantum private comparison based on eight-qubit entangled state

Abstract

Quantum private comparison (QPC) aims to solve "Tiercé problem" based on the laws of quantum mechanics, where the "Tiercé problem" is to determine whether the secret data of two participants are equal without disclosing the data. In this paper, we study, for the fist time, the utility of the eight-qubit entangled state for QPC. We propose a new QPC protocol, which enables two participants to compare the equality of their private data. In the proposed protocol, only single-particle measurements are employed except necessary technologies such as preparing quantum states. We show that the security towards both the outsider attack and the insider attack can be guaranteed.